According to French website Gamekult, the Nintendo Wii U sold over 307k units in Japan in its launch week (2 days).

Much like the American release, the Wii U has an attach rate of 1.2. For comparison, the Wii sold 350k on launch week according to Media Create but had a better software attach rate compared to the below.

Furthermore, Super Mario Bros U sold over 160k, Monster Hunter 3 106K and Nintendo Land 67k. For other totals please see the below list: